Which type of the nitrogen-fixing bacteria are thought to maintain a low oxygen concentration (microaerobic conditions) through their high levels of respiration

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#Question id: 11381

#Unit 10. Ecological Principles

Which of the following is decreasing order of NPP per unit area of different ecosystem?

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#Question id: 1270

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a major extracellular molecule in mammals containing no protein portion?

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#Question id: 12483

#Unit 2. Cellular Organization

ATM and ATR are protein kinases that become activated following specific types of DNA damage. 

A. ATM becomes activated in response to double‐strand breaks, which are detected by the MRN protein complex. 

B. ATR becomes activated by protein‐coated ssDNA that forms when replication forks become stalled or the DNA is being repaired after various types of damage.

C. ATR phosphorylates and activates the checkpoint kinase Chk2, which phosphorylates p53. D. ATM phosphorylates and activates the checkpoint kinase Chk1, which phosphorylates and inactivates the phosphatase Cdc25.

Which of the following combination is incorrect?

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#Question id: 352

#Unit 1. Molecules and their Interaction Relevant to Biology

One mole (mol) of glucose (molecular mass = 180 daltons) is ________.

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#Question id: 567

#Unit 1. Molecules and their Interaction Relevant to Biology

Penicillin and related drugs inhibit the enzyme; this enzyme is produced by